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Brightening of Optical Forbidden Interlayer Quantum Emitters in WSe2 Homobilayers
Na Liu1,2, Licheng Xiao1,2, Yuxing Liu1,2
1Department of Physics, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States.
ACS Nano
|February 19, 2025
Summary
Brightening momentum-indirect interlayer excitons (IXs) in WSe2 using strain and plasmonic cavities enhances their optical properties. This breakthrough enables brighter single-photon emission for quantum communication applications.
Area of Science:
- Quantum Optics
- Materials Science
- Condensed Matter Physics
Background:
- Interlayer excitons (IXs) in van der Waals materials offer potential for quantum technologies due to large dipole moments.
- Their indirect Q-K transition is momentum-forbidden, limiting optical applications.
Purpose of the Study:
- To brighten momentum-indirect Q-K transitions in IX quantum emitters (QEs).
- To enhance optical emission for quantum communication.
Main Methods:
- Utilized local strain and plasmonic nanocavity coupling on 2H-stacked bilayer WSe2.
- Analyzed photoluminescence (PL), magneto-PL, and angle-resolved PL.
- Measured exciton lifetimes (T1) and g-factors.
Main Results:
- Achieved a 10-fold increase in emission intensity and a 24-fold enhancement in T1 lifetime.
- Demonstrated bright single-photon emission rates up to 1.45 MHz.
- Pushed emission wavelength to 810 nm for free-space quantum communication.
Conclusions:
- Simultaneous strain and plasmonic cavity coupling effectively brightens momentum-indirect IX transitions.
- This method enhances IX quantum emitters for practical quantum optical applications and communication.
Keywords:
bilayer WSe2free-space quantum communicationinterlayer excitonsplasmonic cavitiesquantum emittersstrain engineering
